Pilot-valve



R. C. KIMBALL.

PILOT VALVE.

APPLICATION FILED o:c.a. ml.

1,319,006. Patented Oct. 14,1919.

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RUSSELL c. KiMBALL, OF SALEM, MASSACHUSETTS. finer-vu va.

Specification of Letters iatent.

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Patented Oct. 14, 1919.

ispuaea'n liled lbeoniher 3, 1917. Serial No. 205,021.

To all whom it may concern:

Be it known that I, Ru sian. 0. timers-L, citizen of the United States, residing at alem, in the county of Essexand of Massachusetts, have invented new and 11seful Improvements in Pilot-Valves, of which the following is a specification.

This invention relates to improvements in valves and particularly to t e type of valves known as fpilot valves used in connection with darn'per regulator's. l v l The object of the present invention is to provide a simple, durable and economical valve which is so constructed asto prevent leakage which would afl'ect the normal 0pei'ationthereof and the workin' of which may be easily removed eit er for inspection or replacement. v M Another object of the i I'lVIition is to proi ide a conical valve for controlling the passage of fluid from the intake port to the delivery 'port and a s der fifil lal valve for controlling the passage of fluid item the delivery port to the discharge port thereof. I Still another object of the invention is to provide means for lubricating and lacking the E'Yotruding stem of the valve t ion 11 whic connection is ,m'de with the damper operatinginstrumental ties. I

Theinvelition consists iii the combina ion ai'i a iigehient of parts set the fiuewiii" sfie'cificatioii and partied an pei tea fltqi the claims.

it? l'i'illg to the dr'awiii' V cs1 1s fare t al, site was a ef m fidyina t is .ihreht e .e

a ransverseselctieii 'akefi Oti the ii're" lar line 2-2 of i'g. 1.

Like n merals refer to like parts in Both ei Q he draw v v Iii the drawings, 1 i cas ing having an intake ort 2, a delivery pen; 3 ends disgoi't 4; all thfee of which. hfateintere at s: esee T e-in star test ates. in at; Tp1ef5 which is screiw t ree at; fist 'eiigggemem Mtg sgijtahle supgiyasipe set w re thew th s a T1; e eem e ne s n 3 .3316 6 Mi this hibgile is screw threaded fei "c" which is screw threaded for connection with a suitable discharge pipe, not shown. Qr'convenience in manufacture and to facilitate repairs, the casing 1 is bored 1ongitudinally at 8 to receive a core 9 formed in three sections 9, 9 and 9*, and these sections are forced into said casin so as to make a tight joint between sai core and said 'casing. The bore 8 extends throughout the greater length of said casi and termihates at its lower end in an en arged inte'rnally threaded chamber 10, adapted to receive a screw threaded plug 11 which entirely closes the lower end of said casing.

The lipper end of said bore terminates in an enlarged internally threaded chamber 12, which is partially filled by a screw threaded plug 13, leaving a cylindrical pocket 14b9- tween the inner end of said pin and the end of the upper portion of said core The pocket 14 communicates, through a passage 15, with an oil chamber 16, disposed atone side of said casing and adapted ,to be closed by a screw threaded plug 17. The sections 9 and 9? of said core are separated to forin a recess 18 alining with the delivery port 3. This recess forms a part of the iiitercommunicating passage between said delivery portend the intake and discharge ports 2 and 4 respectively.

The section 9' of said core is bored at 19 its entire length, that from the recess 18 to the chamber 12 T "ejniddle section}? i} also b red at 41 but is slightly larger t an the bore of the section 9f and the lower endof said bore 41 is countersunk at 22 form a conical seat. The lower end of thesectio'n 9 and thelippj'r end of the ction 9 are separate from eac other a s t tantial distance to orm arecess 23, which recess, together withthe bore 41, cohstitutes a portion of the discharge as g e s id w r and i Qi tins with sa kirece'ss 2 is a passage 24 formed i: wi ie .th e tg 1.,,a d.e i doih said recess 23 to the disc arge P w .A .1 etipr tting talve 25 I t H is atmlgged to spjtstf anally, fit the bore 20 of the lower-seccentrally eas es 5 1 against the conical seat 22 of the portion 9 of said core and close communication between the delivery port 3 and the discharge port 4.

The valve 25 is also centrally bored at 27 which extends the entire length of said valve and provides communication between the recess 18 and the lower end of the bore 20 of the core section 9 Communicatin with the chamber 10 is a passage 28, lea ing to the intake port 2, said passage constituting a portion of the supply passage for said valve.

A screen or filter 29 is secured to the lower end of the portion 9 of said core and filters all of the fluid which enters the bore of sald core from the intake port 2. There will be substantially at all times a pressure upon the fluid which enters the casing through the port 2, and this pressure will be exerted against the larger end of the reciprocating valve 25, at certain times, to maintain said valve against its seat 22, and to prevent leakage of said fluid around the lower portion of said valve to the recess 23, a suitable packing ring 30 is attached at the lower end of said valve by means of a screw 31. This packing rin 1s cup-shaped to, engage the walls of sai core and is forced against said walls by the pressure of the fluid.

The upper end of the reciprocating valve 25 which protrudes into the recess 18 is preferabl countersunk at 32 and constitutes a seat or a needle valve 33, said needle valve being loosely secured, preferably by means of a pin 34, to the lower end of a stem 35 which is slidably mounted within the small bore 21 of the core 9, and this stem also passes through the cylindrical pocket 14 and through the plu 13, receiving suflieient lubrication from t e oil contained within the pocket 14 to enable it to work freely and this oil also forms a film about the portion thereof within the small bore 21 and assists in preventing a leak at this point.

The plug 13 is recessed at 36 to receive suitable packing 37, the upper end of said recess being internally threadedto receive a screw threaded plug 38 which is bored at 39 to receive the stem35. The upper end of said stem is enlarged at 40 for engagement with the damper regulating instrumentalities, not shown in the drawings.

The operation of the valve hereinbefore specifically described is as follows:

The reciprocating valve 25 will be normally in engagement with the seat 22 and closes the passage connecting the port 3 with the port 4, and at this time the needle valve 33 may be slightly raised from its seat 32, permitting fluid to enter through the port 2, chamber 10, screen-29, bore 20 and through the passage 27 ofsaid reciprocating valve to the port 3, the pressure of said fluid gangs and of said valve Being suflicient to maintain said reciprocating valve against its seat.

When the mechanism to be connected with the stem 35 operates said stem to move the needle valve 33 into engagement with the seat 32 of the valve 25, the passage throu h said valve 25 will be closed, shutting off 1: 1e supply of fluid to the port 3 and a continued movement of said stem in the same direction depresses said reciprocating valve until the portion 26 thereof is moved away from its seat 22. This movement of said valve permits the fluid, which had previously passed through the delivery port 3 into the chambers communicating therewith, to return through the portion 41 of the bore of said core which surrounds the portion of said reciprocatin valve immediately above the conical portion thereof and this portion 41 is slightly larger than the adjacent portion of said valve and constitutes a passage through which said fluid will pass through the recess 23 then through the passa e 24 to the discharge port 4, and after su cient fluid has been permitted to escape therethrough, the pressure will be reduced and the mechanism engaging said stem will act to withdraw the needle valve 33 from its seat 32 and the pressure of the fluid from the intake ort will act against said reciprocating va ve to move the same against its seat 26; the withdrawal of the valve 33 from its seat 32 ermits fluid to pass through the port- 3 an out to the chambers connected therewith.

In view of the arrangement of the valves in relation to their respective Passages and particularly in view of the construction of said valves, the wearing of said valves will not develop any dangerous leaks for the reason that said valves are conical in shape and any wear on the seats thereof will only cause them to seat more tightly. The valve stem 35 is arranged in such a way that any leakage due to the wear of said stem in its socket. will not affect the operation of the device and all of the Wear which may take place at this point may readily be counteracted by serewing down the plug 38 and thus tighten the packing surrounding said stem and the method of lubricating said stem will also serve to greatly reduce such wearing action.

Having thus specifically described my invention what I claim and desire by Letters Patent to secure is: r Y

1. In a device of the class described a 03s ing provided with delivery, intake and discharge ports, a fluid pressure valve adapted, to be actuated by the pressureof fluid entering said intake port to close communication between said delivery port and said discharge port, and a second valve operable exteriorly of said casing to close-communica-r tion between said delivery port and said in a savers-seam Said dfsc g6 port:

casing providedyirig p 7, ig 3011 and i, having supplyafidf ischarg pas ages comdg segear s rea va ve prov1de wit a pasgpg tending therethrough, constituting a portion of said supply passage, a conical valve seat for said valve, said valve being adapted to be moved, by the pressure within said supply passage, against said seat to close said discharge passage, a second valve adapted to seat on said reciprocatin valve and close the passage therethrou l1, whereby said supply passage will be c osed, and a valve stem for said second named valve, adapted to protrude from said casing, whereby said second-named valve may be operated ex teriorly to open or close communication between said delivery port and said supply passage and to open communication between said discharge passage and said delivery port.

3. In a device of the class described a casing provided with delivery, intake and discharge ports, said casing also havi passages connecting said intake port wit said delivery port and said discharge port with said delivery port, a reciprocating conical valve adapted to be operated by fluid pressure withln the passage from said intake port to said delivery port to close said discharge port, said reci rocating valve having a passage extending erethrough, and a second conical valve operable from the exterior of said casing, adapted to seat upon said reciprocating valve and to close the passage therethrough, said second named valve being also adapted to move said reciprocating valve to open said discharge passa e.

4. In a device of the class descri ed a casing provided with delivery, intake and discharge ports, said casing also having a passage connecting said intake port with said delivery port and a passage connecting said discharge port with said delivery port, a valve adapted to be operated by the pressure withinthe passage from said lntake port to automatically close the assage from said discharge port to said elivery port, said valve having a passage extending therethrough, adapted to constitute a portion of the passage from said intake port to said delivery port, and a second valve operable toward and awa from the first-named valve from the exterior of said casing adapted to seat against the end of said first-named valve and close the passage therethrough, sald second named valve being also adapted to operate said first named valve to open the passa e leading to said discharge port from said do ivery port.

5. In a device of the class described a In d Ice 1 .1 if '5 evi at e 1 a Q 'Qi dd i il i .P t ase [cal valve adaptei" ftuated by ar i ifi iii a .t use other passage, said valge hayi l a P sa h e s'a sh ais l tige ts? 1011 a a pressure passage, a secon ,gidgpendentl of sai first-named va ve and a apted to c ose the passage through said first named valve, and means connected with said second named valve, adapted to operate the same from the exterior of said casing.

6. In a device of the class described a casing provided with a pair of passages, a coni cal valve adapted to be actuated by fluid pressure in one of said assages to close the other passage, said conical valve having a passage therethrough constituting a portion of a pressure passage, a reciprocating valve stem arranged to protrude from said casing, and a second valve loosely connected with said stem, adapted to be operated to close the passage through said conical valve and to move said conical valve to open the passa e controlled thereby.

In a device of the class described a casing provided with a pair of passages, a conical valve adapted to be actuated by fluid pressure in one of said passages to close the other passage, said valve having a passage therethrough constituting a portion of a pressure passage, a reciprocating valve stem arranged to protrude from said casing, a lubricant container in said casing surrounding said stem and through which said stem extends and a second valve connected with said stem, adapted to be operated to close the passage through said valve and to move said valve to open the passage controlled thereby.

8. In a device of the class described a casing provided with a supply passage and a discharge passage, a reciprocatory conical pressure valve arranged to be operated by fluid pressure within said supply passage to close said discharge passage, said valve having a passage therethrough constituting a part of said supply passage, a packing ring attached to said rcciprocatory valve, adapted to be expanded by the pressure against said valve, and an exteriorly operated conical valve mounted independently of and adapted to seat against, said reciprocatory valve to close the passage therethrough and to move said reciprocatory valve to open the passage controlled thereby.

' 9. In a device of the class described a cas ing provided with a supply passage and a dlscharge passage, a reciprocatory conical pressure valve arranged to be operated by fluid pressure within said supply passage to close said discharge passage, said valve having a assage therethrough constituting a part 0 said supply passage, a packin rm attached to said reciprocatory valve, 9. apte s ree s?! eedarrssse sas r daia aid vas s to be expanded by the pressure a inst said my hand in presence of two subscribing-witvalve, and a, screen arranged at t e rear of masses.

said reeiprocatory valve, adapted to filter RUSSELL C. KIMBALL. fluid assmg thereto and constltuting a stop Witnesses: 5 for sand valve. SYDNEY E. TAFT,

In testimony whereof I have hereunto set HAT-rm E. .STRATTON.

Daniel at this patent may be obtained for five cents each, by addressing the "Gemmissioner of Patents,

Wnlhington, D. O. 

